Improvement in rivets



EDWARD BOURNE, OF PITTSBURG, PENNSYLVANIA.

Letters Patent No. 86,726, dated Fehrua/ry 9, 1869.

IMPROVEMENT IN RIVETS.

The Schedule referred to in these Letters Patent and making part of thesame lo all whom it may concern:

Be it known that I, EDWARD Boonnn, of Pittsburg, in the county ofAllegheny, and State of Pennsylvania, have invented a new andusefulllmprovement in the Construction of Sheet-Iron Radiators, such asare used for the purpose of Warming dwellings by the heatingpower ofsteam; and I hereby declare that the following is a full, clear, andexact description of my invention, reference being hadto theaccompanying drawings, forming part of this specification, and to theletters of reference marked thereon.

The invention I have made consists in uniting the thin metallic sheets,composing the radiator, by passing conical-headed rivets transversely,at regular intervals, through the sheets, and through metallic washersplaced between them, each washer having a hole through it for thatpurpose, corresponding in shape to that of the rivet-head, so that, inforcing up the rivets, by hammering or otherwise, that portion of thesheet next the head of each rivet, and immediately surrounding it, willbe drawn into the conical opening of the washer, thereby stiffening thesheet, and making a perfectly steam-tight joint.

To enable others skilled in the art of making this class of radiators,to understand and put in practice my invention, I will proceed todescribe it by reference to the accompanying drawings, wherein- Figure 1represents a transverse section of a couple of thin iron plates, unitedin accordance with my plan, and exhibits the rivet and washers used forthat purpose.

Figure 2 represents a top view of the upper plate.

Figure 3 represents an ordinary small flat washer.

Figure 4, conical-headed rivet.

Figure 5, deep washer, with conical hole through it.

To construct a sheet-metal radiator, 1 take two thin sheets of goodiron, and punch small round holes, P, through them, just the size of thebody of the intended rivet.

This rivet, A, is provided with a large conical head, which is to beinserted in the lower sheet, E. Over this rivet A, I place a deepwasher, B, haxdng a funnel-shaped opening through it, with the largestpart of the opening down, or toward the head of the rivet.

I then, by means of a set-punch, placed over the rivet, force the washerB down, which act draws the head of the rivet A into the conical orfunnel-shaped opening in the washer B, taking with it a portion of thesheet E, immediately surrounding the head, as seen at fi 1.

Ag soon as this is done, 1 place over the rivet another sheet, D, andthen a small ordinary washer, O, and burr the rivet in the usual manner.

The object of this contrivance is to stiffen the lower sheet E, byraising the sheet around each rivet out of the line of its plane, andalso to give a greater bearing around the head of the rivet, to insure asteam-tight joint.

Having briefly described my invention,

I claim uniting the thin sheets of metallic radiators by means ofconical-headed rivets, used in combination with funnel-shaped washers,in such a manner as to draw that portion of the sheet next therivet-head into the washer, substantially in the way herein shown andset forth.

EDWARD BOURNE. W'itnesses J osmn W. ELLs, ANDREW J. CARROLL.

